Current Flag

Description of current flag:
The flag's ratio is 3:5. It is a black over yellow horizontal bicolour with centred arms.
Source: this online catalogueKlaus-Michael Schneider, 25 June 2017

Coat of Arms

Description of coat of arms:
Shield Or, a helmet Azure, crested with two buffalo horns Sable implemented with peacock feathers Vert, in base between two strings Gules a fleur-de-lis Azure.
Meaning:
The arms are based on the oldest seal of the city with prints since 1335. The second seal, which is slightly younger, is identical, except for the lily. The lily is most likely the symbol of the local monastery. Helmet and crest are those of the Dukes of Braunschweig-Lüneburg, who ruled the city in the early 14th century.
Source: Stadler 1970, p.18
Klaus-Michael Schneider, 25 June 2017